Univariable analyses of predictor variables of practice admission rate (n=145) 2007/8
| Variable | IRR (95% CI) | % Change | p Value |
| Total clinical points | 0.998 (0.99 to 0.999) | −0.2% | 0.02 |
| Total organisational points | 0.998 (0.99 to 0.999) | −0.2% | 0.04 |
| % Satisfied with phone access | 0.995 (0.99 to 0.998) | −0.5% | 0.003 |
| % Able to book 2 days ahead | 0.996 (0.99 to 0.999) | −0.4% | 0.0008 |
| % Able to get appointment in 48 h | 0.99 (0.98 to 0.997) | −1.0% | 0.0007 |
| % Able to book with a specific GP | 0.99 (0.98 to 0.996) | −1.0% | 0.0001 |
| % Satisfied with opening hours | 0.99 (0.98 to 1.01) | −1.0% | 0.21 |
| Distance from hospital (miles) | 0.98 (0.97 to 0.99) | −2.0% | <0.0001 |
| % of Practice male | 0.99 (0.97 to 1.02) | −1.0% | 0.46 |
| Age (% of practice patients 65+ years) | 1.01 (0.99 to 1.02) | 1.0% | 0.1 |
| Practice deprivation score | 1.01 (1.009 to 1.02) | 1.0% | <0.0001 |
| % of Practice white ethnicity | 0.998 (0.995 to 0.999) | −0.2% | 0.02 |
| Size of practice (no of patients) | 0.99998 (0.99997 to 0.99999) | −0.002% | 0.0003 |
| Coronary heart disease prevalence | 1.09 (1.03 to 1.16) | 9.0% | 0.002 |
| % Response rate to access survey | 0.99 (0.98 to 0.998) | −1.0% | 0.006 |
N=145 for all variables.
Figures in the second column are incident rate ratios (IRR). Subtracting 1 from the IRR and then multiplying by 100 gives the percentage change in the expected admissions count for a 1 unit increase in the predictor. So for practice deprivation score, for every extra deprivation point, the expected admissions count increases by 1%. IRR less than 1.0 represent decreases and IRR greater than 1.0 represent increases in the count. Statistical model: negative binomial regression, using log of the list size as the offset.
GP, general practitioner.